Luigi's Mansion 2 HD

Secret Mine Gems and Missions Guide

Luigi's Mansion 2 Walkthrough Team

Last updated on: July 3, 2024 04:08 AM

Secret Mine is the fourth mansion in Luigi's Mansion 2 HD (Dark Moon). See a map of Secret Mine, a list of missions, Secret Door levels, as well as the locations of all collectible Boos and Gems found in this mansion!

Previous Mansion					Current Mansion					Next Mansion
Old Clockworks					Secret Mine					Treacherous Mansion
D-1			D-2			D-3			D-Boss			D-Bonus

List of Contents

Map
Gem Locations
Boo Locations
Secret Door Bonuses
Missions
Related Guides

Secret Mine Map

★ Press the icons on the right side to show collectibles and points of interest on the map.

★ Toggle the Full On icon to expand the map.

The Interactive Map both shows the location of key points on the map, and doubles as a collectible checker.

Click an icon on the right side to show all the pins of a specific type, or click the magnifying glass button to search for a specific pin by name.
Click a pin on the map to see its name and description, and a relevant picture or video if available.
From here, click Mark as Acquired to indicate that you've gotten a collectible already. This will change its icon on the map to show that it has been collected, and add 1 to that pin type's Counter.
To undo this, click on the same pin and click Restore to unclaimed.
To check how many pins you have marked so far, check the Counter in the bottom left, and click the icon that looks like a checklist to see counters for all pin types.
If the collected pins start to get in the way, you can hide them all by clicking the green Show Pins button on the left side.

Icon	How to Use
	Show Names This button reveals the Name of every icon currently shown.
	Show Pins This button will toggle between showing and hiding all the pins which you have already marked as acquired.
	Fullscreen This button will change the map display to fill the screen.
	Search Mode Toggle This button will display a searchbar which you can use to search for an individual pin by its name.
	Icon Mode Toggle In Search Mode, this button will toggle you back to Icon Mode, removing the search bar and displaying the icons again.
	All Pins This button is shown along with the Icons on the right when there are over 6 types of pins. Click it for a full selection of all available pin types.
	Counter Tracks the number of pins you have of a certain type. The pin type shown is set to the page and currently cannot be changed; however, all pin type counters can be viewed by clicking the checklist icon on the right side.
	View All Counters This icon is found on the right side of the Counter. When a map has more than one pin type, click this icon to see Counters for all pin types.
	Zoom In / Zoom Out This icon is found on the top left side of the map. You can press these buttons, or use your scroll wheel while hovering, to Zoom In and Out of the interactive map.

All Collectibles
Boo Locations	Gem Locations

Secret Mine Gems

Display all Only checked Only unchecked

Gem	Mission	Also Found In	How to Find
Circle Sapphire	D-1 Cold Case	All D missions, Bonus	Room: Smokehouse Head into the Smokehouse, defeat all the enemies inside, use the Dark-Light Device to reveal a coat hanging on the north wall by the door, pull it down, and a Circle Sapphire will drop.
Triangle Sapphire	D-1 Cold Case	All D missions, Bonus	Room: Fishing Hut Head towards the Fishing Hut after the cutscene with the Boo, suck up the snow by the entrance on the left, and you will obtain a Triangle Sapphire.
Rectangle Sapphire	D-1 Cold Case	D-1	Room: Under the Ice After the cutscene with the Toad, go to the upper floor of Under the Ice with the Toad, shoot the Toad towards the hole in the north wall, and Toad will slide down the lower floor with the Rectangle Sapphire.
Football Sapphire	D-1 Cold Case	All D missions, Bonus	Room: High Wires Head to the High Wires, use the Poltergust to swing onto the platform with a nest on the west wall, use the Strobulb to scare the birds, and use the Poltergust again to suck the Football Sapphire.
Drop Sapphire	D-1 Cold Case	All D missions, Bonus	Room: Airway Head to the Airway via the Terminal and use the telescope to see that the gem was dropped into a barrel by a bat. Head to the Airway via the Basin, go across the rope bridge, and interact with the barrel on the other side to obtain the Drop Sapphire.
Stone Sapphire	D-2 Hit Rock Bottom	D-2 to D-3, Bonus	Room: Chalet Approach Head out to Chalet Approach, use your Poltergust to get the flaming turkey on top of the grill in the west, use it on the frozen painting just down the stairs on the east, and use the Dark-Light Device on the painting to obtain the Stone Sapphire.
Rhombus Sapphire	D-2 Hit Rock Bottom	D-2 to D-3, Bonus	Room: Prospector's Crossing Head into Prospector's Crossing, use the Dark-Light Device to reveal a hidden pickaxe near the hanging lantern, use the Poltergust on the pickaxe to reveal hidden blocks of wood behind the wall, and use the wooden blocks to break the ice where the Rhombus Sapphire is stuck.
Star Sapphire	D-2 Hit Rock Bottom	D-2 to D-3, Bonus	Room: Skip Slope Slide down the Skip Slope, head towards the left side, and try to grab the Star Sapphire as you're sliding down.
Octagon Sapphire	D-2 Hit Rock Bottom	D-2 to D-3, Bonus	Room: Shaft Head down the Shaft by using the Poltergust to turn the gear on the lift, once you reach the bottom, pull the chain, then head up until you see a hole containing the Octagon Sapphire.
Oval Sapphire	D-2 Hit Rock Bottom	D-2 to D-3, Bonus	Room: Deep Hall After you have transported some rocks from Pit Mine, use the Poltergust on the rocks and set it on fire in the fire pit, then aim the flaming rock on the ceiling just above the fire pit, and the Oval Sapphire will drop.
Spindle Sapphire	D-3 Across the Chasm	D-3, Bonus	Room: Crossroads Head into Crossroads, go through the portal, use the Dark-Light Device to reveal the drawer opposite the door, and suck up all the snow to obtain the Spindle Sapphire.
Coffin Sapphire	D-3 Across the Chasm	D-3, Bonus	Room: Crystal Quarry E-Gate Head into Crystal Quarry, use the Strobulb to open the portal, and once you go through the portal, it will lead you to the Chalet along with the Coffin Sapphire.
Mushroom Sapphire	D-3 Across the Chasm	D-3	Room: High Wires After you melt down the frozen swings in the Gondola, head towards High Wires. Use the Poltergust to reach the platform on the west, then go across the fallen tree to the north until you reach a door with a crescent moon symbol. After entering the door, complete the time challenge, and you will receive the Mushroom Sapphire as a reward.

Gem Locations: How to Find All Gems

Secret Mine Boos

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Mission	Boo Name	HP	How to Find
D-1 Cold Case	Boofoon	35	Room: Terminal Enter the terminal, pull down the sheet on the east side to reveal a huge mirror, and use the Dark-Light Device on the barrel opposite to the mirror. Suck up all the spirit balls to reveal the Boo.
D-2 Hit Rock Bottom	Booger	35	Room: Chalet Enter the chalet and use the Dark-Light Device in the northeast corner, where a rocking chair originally was. Suck up all the spirit balls to reveal the Boo.
D-3 Across the Chasm	ParaBoola	35	Room: Deep Hall Enter the deep hall, use the Dark-Light Device on the fire pit where a tea kettle originally was, suck up all the spirit balls, and push the kettle above the fire to reveal the Boo.

All Boo Locations: Where to Find All Boos

Secret Mine Secret Door Bonus Levels

Mission	Location	How to Beat	Rewards
D-1 Cold Case	Drift Hall	Shoot the projectiles into the snowman's face within the time limit.	Treasure
D-3 Across the Chasm	High Wires	Capture all the Hiders.	Mushroom Sapphire

All Secret Door Locations and Rewards

Secret Mine Missions

Secret Mine Missions
D-1		D-2		D-3
Boss			Bonus

D-1 Cold Case

D-1 Cold Case
Goal	The Toad assistant assigned to the Secret Mine is not answering E. Gadd's calls. Find him, and bring him back using the Pixelator Screen in the Chalet. Find the elevator to the Chalet, and use the Pixelator Screen there to send the Toad back to the Bunker.
Boo Location	Terminal
Obtainable Gems	・Circle Sapphire ・Triangle Sapphire ・Rectangle Sapphire ・Football Sapphire ・Drop Sapphire

D-1 Cold Case Walkthrough

D-2 Hit Rock Bottom

D-2 Hit Rock Bottom
Goal	The security image revealed strange events in the Crystal Quarry at the bottom of the mine. Get there as soon as possible, and figure out what the Boos are doing with the ghosts.
Boo Location	Chalet
Obtainable Gems	・Stone Sapphire ・Rhombus Sapphire ・Star Sapphire ・Octagon Sapphire ・Oval Sapphire

D-2 Hit Rock Bottom Walkthrough

D-3 Across the Chasm

D-3 Across the Chasm
Goal	Find the access to the gondola in the Terminal. Board it, and cross the chasm to reach the location of the Dark Moon piece. Remove the paranormal chains that block the door to the gondola. Capture each ghostly culprit to vanish each chain. Find another way to cross the chasm. Reach the Workshop, and look for the Dark Moon piece.
Boo Location	Deep Hall
Obtainable Gems	・Spindle Sapphire ・Coffin Sapphire ・Mushroom Sapphire

D-3 Across the Chasm Walkthrough

Chilly Ride

Chilly Ride
Goal	Open the door to the Workshop. Once inside, search for the Dark Moon piece. The possessor is trying to get away, and the sled is overheating! Catch him, and retrieve the Dark Moon piece!

Chilly Ride Walkthrough

Severe Infestation

Severe Infestation
Goal	Ghosts are back in the Secret Mine. Find and capture all the ghosts as fast as you can!

Severe Infestation Walkthrough

Luigi's Mansion 2 HD Related Guides

Luigi

All Mansions and Stages

All Mission Guides

Gloomy Manor
A-1	A-2		A-3
A-4	A-5		Boss
Bonus Mission
Haunted Towers
B-1	B-2		B-3
B-4	B-5		Boss
Bonus Mission
Old Clockworks
C-1	C-2		C-3
C-4	C-5		Boss
Bonus Mission
Secret Mine
D-1	D-2		D-3
Boss		Bonus
Treacherous Mansion
E-1	E-2		E-3
E-4	E-5		Boss
Bonus Mission
King Boo's Illusion
A Nightmare to Remember

Post-Game

Post-Game Guide
ScareScraper Guide	Ending and Post-Game Content	100% Checklist

ScareScraper Records Board

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